Browsing by Author "Andika, Irham Taufik"

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JWST and ALMA Discern the Assembly of Structural and Obscured Components in a High-redshift Starburst Galaxy
(2024-06-01) Liu, Zhaoxuan; Silverman, John D.; Daddi, Emanuele; Puglisi, Annagrazia; Renzini, Alvio; Kalita, Boris S.; Kartaltepe, Jeyhan S.; Kashino, Daichi; Rodighiero, Giulia; Rujopakarn, Wiphu; Suzuki, Tomoko L.; Tanaka, Takumi S.; Valentino, Francesco; Andika, Irham Taufik; Casey, Caitlin M.; Faisst, Andreas; Franco, Maximilien; Gozaliasl, Ghassem; Gillman, Steven; Hayward, Christopher C.; Koekemoer, Anton M.; Kokorev, Vasily; Lambrides, Erini; Lee, Minju M.; Magdis, Georgios E.; Harish, Santosh; McCracken, Henry Joy; Rhodes, Jason; Shuntov, Marko; Ding, Xuheng
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
We present observations and analysis of the starburst PACS-819 at z = 1.45 (M * = 1010.7 M ⊙), using high-resolution (0.″1; 0.8 kpc) Atacama Large Millimeter/submillimeter Array (ALMA) and multiwavelength JWST images from the COSMOS-Web program. Dissimilar to Hubble Space Telescope (HST) ACS images in the rest-frame UV, the redder NIRCam and MIRI images reveal a smooth central mass concentration and spiral-like features, atypical for such an intense starburst. Through dynamical modeling of the CO (J = 5-4) emission with ALMA, PACS-819 is rotation dominated and thus consistent with having a disk-like nature. However, kinematic anomalies in CO and asymmetric features in the bluer JWST bands (e.g., F150W) support a more disturbed nature likely due to interactions. The JWST imaging further enables us to map the distribution of stellar mass and dust attenuation, thus clarifying the relationships between different structural components not discernible in the previous HST images. The CO (J = 5-4) and far-infrared dust continuum emission are cospatial with a heavily obscured starbursting core (<1 kpc) that is partially surrounded by much less obscured star-forming structures including a prominent arc, possibly a tidally distorted dwarf galaxy, and a massive clump (detected in CO), likely a recently accreted low-mass satellite. With spatially resolved maps, we find a high molecular gas fraction in the central area reaching ∼3 (M gas/M *) and short depletion times (M gas/SFR ∼ 120 Myr, where SFR is star formation rate) across the entire system. These observations provide insights into the complex nature of starbursts in the distant Universe and underscore the wealth of complementary information from high-resolution observations with both ALMA and JWST.
The MBH-M∗ Relation up to z ∼ 2 through Decomposition of COSMOS-Web NIRCam Images
(2025-02-01) Tanaka, Takumi S.; Silverman, John D.; Ding, Xuheng; Jahnke, Knud; Trakhtenbrot, Benny; Lambrides, Erini; Onoue, Masafusa; Andika, Irham Taufik; Bongiorno, Angela; Faisst, Andreas L.; Gillman, Steven; Hayward, Christopher C.; Hirschmann, Michaela; Koekemoer, Anton; Kokorev, Vasily; Liu, Zhaoxuan; Magdis, Georgios E.; Renzini, Alvio; Casey, Caitlin; Drakos, Nicole E.; Franco, Maximilien; Gozaliasl, Ghassem; Kartaltepe, Jeyhan; Liu, Daizhong; McCracken, Henry Joy; Rhodes, Jason; Robertson, Brant; Toft, Sune
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Our knowledge of relations between supermassive black holes and their host galaxies at z ≳ 1 is still limited, even though being actively sought out to z ∼ 6. Here, we use the high resolution and sensitivity of JWST to measure the host galaxy properties for 107 X-ray-selected type-I active galactic nuclei (AGNs) at 0.68 < z < 2.5 with rest-frame optical/near-infrared imaging from COSMOS-Web and PRIMER. Black hole masses ( log M BH / M ⊙ ∼ 6.9 − 9.6 ) are available from previous spectroscopic campaigns. We extract the host galaxy components from four NIRCam broadband images and the Hubble Space Telescope/Advanced Camera for Surveys F814W image by applying a 2D image decomposition technique. We detect the host galaxy for ∼90% of the sample after subtracting the unresolved AGN emission. With host photometry free of AGN emission, we determine the stellar mass of the host galaxies to be log M * / M ⊙ ∼ 9.5 − 11.6 through spectral energy distribution fitting and measure the evolution of the mass relation between SMBHs and their host galaxies. Considering selection biases and measurement uncertainties, we find that the MBH/M*ratio evolves as 1 + z 0.4 8 − 0.62 + 0.31 thus remains essentially constant or exhibits mild evolution up to z ∼ 2.5. We also see an amount of scatter ( σ μ = 0.3 0 − 0.13 + 0.14 ), similar to the local relation and consistent with low-z studies, and a noncausal cosmic assembly history where mergers contribute to the statistical averaging toward the local relation is still feasible. We highlight improvements to come with larger samples from JWST and, particularly, Euclid, which will exceed the statistical power of current wide and deep surveys.
Uncovering a Massive z∼7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web
(2024-01-01) Lambrides, Erini; Chiaberge, Marco; Long, Arianna S.; Liu, Daizhong; Akins, Hollis B.; Ptak, Andrew F.; Andika, Irham Taufik; Capetti, Alessandro; Casey, Caitlin M.; Champagne, Jaclyn B.; Chworowsky, Katherine; Clarke, Tracy E.; Cooper, Olivia R.; Ding, Xuheng; Dong, Dillon Z.; Faisst, Andreas L.; Forman, Jordan Y.; Franco, Maximilien; Gillman, Steven; Gozaliasl, Ghassem; Hall, Kirsten R.; Harish, Santosh; Hayward, Christopher C.; Hirschmann, Michaela; Hutchison, Taylor A.; Jahnke, Knud; Jin, Shuowen; Kartaltepe, Jeyhan S.; Kleiner, Emma T.; Koekemoer, Anton M.; Kokorev, Vasily; Manning, Sinclaire M.; Martin, Crystal L.; McKinney, Jed; Norman, Colin; Nyland, Kristina; Onoue, Masafusa; Robertson, Brant E.; Shuntov, Marko; Silverman, John D.; Stiavelli, Massimo; Trakhtenbrot, Benny; Vardoulaki, Eleni; Zavala, Jorge A.; Allen, Natalie; Ilbert, Olivier; McCracken, Henry Joy; Paquereau, Louise; Rhodes, Jason; Toft, Sune
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
In this Letter, we report the discovery of the highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in the COSMOS-Web field. Using multifrequency radio observations and mid-IR photometry, we identify a powerful, RL, growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution (f1.28 GHz ∼ 2 mJy, q24 μm = −1.1, α1.28−3 GHz = − 1.2, Δα = − 0.4). In conjunction with ALMA, deep ground-based observations, ancillary space-based data, and the unprecedented resolution and sensitivity of JWST, we find no evidence of AGN contribution to the UV/optical/near-infrared (NIR) data and thus infer heavy amounts of obscuration (NH > 1023 cm−2). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-z of zphot = 7.7-+0.30.4 and estimate an extremely massive host galaxy (log M* = 11.92 0.5M) hosting a powerful, growing supermassive black hole (LBol = 4−12x × 1046 erg s−1). This source represents the farthest known obscured RL AGN candidate, and its level of obscuration aligns with the most representative but observationally scarce population of AGN at these epochs.